I am using a Windows computer running e-Sword version 11.0.6
I find that when I copy a verse from the Vietnamese Bible then paste it into Word or or any other document or email it works fine showing accent marks correctly.
However, if I use the e-Sword Copy Verses... feature what is displayed as having been copied is unreadable... crazy accent marks, double characters, etc. - AND, when this is copied and subsequently pasted it is the same mess that was visible in the Copy Verses... window.
Likewise, when I select a verse in the Vietnamese Bible and use the e-Sword Paste into Journal Notes feature then what is pasted is the same mess as is seen in the Copy Verses... window.
Spanish works fine.
This is clearly a bug and needs to be addressed. Praise the Lord that there is the work around of selecting text within the Bible and using Control-C to copy and Control-V to paste and it maintains the integrity of the text.